[GAMEPLAY] Aatrox visual bug

I've discovered a strange interaction between I believe is Aatrox ult, W and passive. So after I ulted and used my W to deal some dmg and my blood well was used to bring me back to life blade stayed purple till end of the match. I know it isn't very big issue, but sometimes when fight is intense u may look on your blade and say "OMG I'm low on HP I better chanege it for some lifesteal" and this moment you're going to die, because Blood Thrist was already triggered and u change it to Blood Price.